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timing [2016/07/24 17:58]
pereira 		timing [2019/05/24 14:10]
pereira
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 Although it is possible to measure the ToF between any pair of timing sources, there are three "standard" measurements provided to any experiment, namely, between the cyclotron and the S800 FP (RF-FP); between the A1900 FP and the S800 FP (XFP-FP); and between the S800 OBJ and FP (OBJ-FP). These ToFs are electronically recorded in a {{:wiki:Manual_Phillips_TDC_7186.pdf|Phillips 7186 TDC}}, a {{:wiki:MTDC-32.pdf|Mesytec TDC}} (MTDC), and a group of {{:wiki:Manual_Ortec_TAC_566.pdf|Ortec 566 TACs}}, all them located in the [[Electronics#Crate Configuration|electronic racks in S3]], near the FP box.  Although it is possible to measure the ToF between any pair of timing sources, there are three "standard" measurements provided to any experiment, namely, between the cyclotron and the S800 FP (RF-FP); between the A1900 FP and the S800 FP (XFP-FP); and between the S800 OBJ and FP (OBJ-FP). These ToFs are electronically recorded in a {{:wiki:Manual_Phillips_TDC_7186.pdf|Phillips 7186 TDC}}, a {{:wiki:MTDC-32.pdf|Mesytec TDC}} (MTDC), and a group of {{:wiki:Manual_Ortec_TAC_566.pdf|Ortec 566 TACs}}, all them located in the [[Electronics#Crate Configuration|electronic racks in S3]], near the FP box. 
  
-Although the timing reference ("start") in the all the ToF modules is given by the FP scintillator E1 up, the electronic path from the detector to each module is different (see {{:wiki:s800electronicstschematics-to20160720.pdf|main electronics diagram}} for more details). +Although the timing reference ("start") in the all the ToF modules is given by the FP scintillator E1 up, the electronic path from the detector to each module is different (see {{:wiki:s800electronicstschematics.pdf|main electronics diagram}} for more details). 
    
 Some important things to know about each of these modules: Some important things to know about each of these modules:
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 ^ E1 up ^ 14  | LeCroy Var. ampl. -> Mesytec MCFD ch #0  -> ECL-NIM -> Fan in/out -> Fan in/out -> Fan in/out -> NIM-ECL | ^ E1 up ^ 14  | LeCroy Var. ampl. -> Mesytec MCFD ch #0  -> ECL-NIM -> Fan in/out -> Fan in/out -> Fan in/out -> NIM-ECL |
 ^ E1 up ^ 15  | LeCroy Var. ampl. -> Mesytec MCFD ch #0  -> ECL-NIM -> Fan in/out -> Fan in/out -> NIM-ECL | ^ E1 up ^ 15  | LeCroy Var. ampl. -> Mesytec MCFD ch #0  -> ECL-NIM -> Fan in/out -> Fan in/out -> NIM-ECL |
 +^ II PPAC2 anode  ^ 16  | Mesytec MCFD2 ch #0 |
 +^ II PPAC2 down  ^ 17  | Mesytec MCFD2 ch #1 |
 +^ II PPAC2 up  ^ 18  | Mesytec MCFD2 ch #2 |
 +^ II PPAC2 right  ^ 19  | Mesytec MCFD2 ch #3 |
 +^ II PPAC2 left  ^ 20  | Mesytec MCFD2 ch #4 |
 +^ II PPAC1 anode  ^ 21 | Mesytec MCFD2 ch #5 |
 +^ II PPAC1 down  ^ 22 | Mesytec MCFD2 ch #6 |
 +^ II PPAC1 up  ^ 23 | Mesytec MCFD2 ch #7 |
 +^ II PPAC1 right  ^ 24 | Mesytec MCFD2 ch #8 |
 +^ II PPAC1 left  ^ 25 | Mesytec MCFD2 ch #9 |
 +
  
 The multi-hit capability requires some special attention. Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (E1 up, which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, SpecTcl will generate an array of OBJ-FP ToFs  called **s800.fp.vmetdc.obj.i**, where i=0 stands for the first hit, i=2 second hit and so on (the corresponding array for XFP-FP TOF is **s800.fp.vmetdc.xfp.i**). The multi-hit capability requires some special attention. Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (E1 up, which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, SpecTcl will generate an array of OBJ-FP ToFs  called **s800.fp.vmetdc.obj.i**, where i=0 stands for the first hit, i=2 second hit and so on (the corresponding array for XFP-FP TOF is **s800.fp.vmetdc.xfp.i**).
timing.txt ยท Last modified: 2020/04/02 20:58 by pereira

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